Fix

package.json

@@ -87,6 +87,7 @@
     "tslint": "5.3.2",
     "uglify-es": "3.0.11",
     "uglify-js": "git+https://github.com/mishoo/UglifyJS2.git#harmony",
+    "uglifyjs-webpack-plugin": "0.4.3",
     "webpack": "2.6.0"
   },
   "dependencies": {

webpack/plugins/index.ts

@@ -1,7 +1,7 @@
-import * as webpack from 'webpack';
 const StringReplacePlugin = require('string-replace-webpack-plugin');
 
 import constant from './const';
+import minify from './minify';
 
 const env = process.env.NODE_ENV;
 const isProduction = env === 'production';
@@ -13,7 +13,7 @@ export default () => {
 	];
 
 	if (isProduction) {
-		plugins.push(new webpack.optimize.UglifyJsPlugin());
+		plugins.push(minify());
 	}
 
 	return plugins;

webpack/plugins/minify.ts

@@ -0,0 +1,3 @@
+const UglifyJSPlugin = require('uglifyjs-webpack-plugin');
+
+export default () => new UglifyJSPlugin();